There are no official Lego minifigures associated with Pulp Fiction. Lego tends to go for properties that are suitable for a wide range of ages, especially kids. Since Pulp Fiction contains content like strong language, violence, and some mature themes, it's not likely to be made into an official Lego set. But the beauty of Lego is that fans can use their imagination and create their own versions of Pulp Fiction - inspired minifigures.
He could interact in a protective way. For example, if it's a small animal like a rabbit, he might build a safe place for it. His military training would make him good at creating a secure environment.
For 'dark winter soldier fanfiction', Falcon could be an interesting character to pair with the Winter Soldier. Falcon has his own set of skills and a strong moral compass. He could help the Winter Soldier navigate the modern world and his newfound freedom. Also, Scarlet Witch would be a fascinating pairing. She could potentially help him deal with his traumatic memories through her powers. And Bucky could also be paired with Doctor Strange. Strange could use his magic to help Bucky understand and control the dark forces within him.
The Winter Soldier is none other than Bucky Barnes. His transformation into this role was a result of manipulation and experimentation. Despite his past actions, he later strives for redemption and works to atone for his deeds.